netdev - Re: Fwd: [PATCH] [-mm] ACPI: export ACPI events via netlink

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Date:	Fri, 29 Jun 2007 14:04:55 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Johannes Berg <johannes@...solutions.net>
CC:	hadi@...erus.ca, Zhang Rui <rui.zhang@...el.com>,
	netdev@...r.kernel.org,
	"linux-acpi@...r" <linux-acpi@...r.kernel.org>, lenb@...nel.org,
	Thomas Graf <tgraf@...g.ch>
Subject: Re: Fwd: [PATCH] [-mm] ACPI: export ACPI events via netlink

Johannes Berg wrote:
> On Fri, 2007-06-29 at 13:51 +0200, Patrick McHardy wrote:
> 
> 
>>Do multicast groups have to have a seperate name? Or would it suffice
>>to have them associated with the genl family and be able to find out
>>the starting group number? In that case something like
>>
>>struct genl_mc_groups {
>>	struct genl_family *family or char *family_name or similar;
>>	unsigned int group_off;
>>	unsigned int group_num;
>>	unsigned long groups[];
>>};
>>
>>seems to make more sense since you only need a single struct
>>per family.
> 
> 
> Hm. For me that'd work too but Jamal wanted dynamically allocated groups
> if I understood him correctly. I'm not too concerned with that case, I'd
> think most people know the groups up-front. On the other hand, I can see
> something like a group per netdev or whatever other instance too.


Maybe use a mix. Use the bitmap, but allow families to register
multiple of them. In the common case it would only be a single
one, but it would be possible to register groups dynamically.

>>Why would you care about holes? If you really want to use sparse
>>bitmaps that would complicate the code a lot.
> 
> 
> No, not sparse bitmaps, but the bitmap could have a hole when a family
> goes away, and we could reuse that group number later. If we have it in
> a bitmap we know without checking all group IDs.


Right.
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